protected function add_settings_message( $errors, $post_id ) {
            if ( count( $errors ) > 0 ) {
                $error_text = __( 'Some errors occurred while trying to save the following post meta:', 'post-types-definitely' );
                foreach ( $errors as $field_slug => $error ) {
                    $error_text .= '<br/><em>' . $field_slug . '</em>: ' . $error->get_error_message();